Polyisocyanate mixture, coating composition, and coating film

Abstract

Provided is a polyisocyanate mixture including: a triisocyanate compound (A) represented by Formula (I); and polyisocyanate (B) obtained from at least one diisocyanate selected from the group consisting of aliphatic diisocyanate, alicyclic diisocyanate, and aromatic diisocyanate.(In Formula (1), a plurality of Y1's each independently represent a single bond or a divalent hydrocarbon group having 1 to 20 carbon atoms which may have an ester structure and/or an ether structure. A plurality of Y1's may be the same as or different from one another. R1 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms.)

The invention claimed is: 
     
       1. A polyisocyanate mixture comprising:
 a triisocyanate compound (A) represented by Formula (I); and 
 polyisocyanate (B1) obtained by using a polyester polyol containing three or more hydroxyl groups as a raw material, the polyisocyanate (B1) having a number average molecular weight of 850 to 5000, which is obtained from at least one diisocyanate selected from the group consisting of aliphatic diisocyanates; 
 wherein Formula (I) is 
 
       
         
           
           
               
               
           
         
       
       in which each Y 1  independently represents a single bond or a divalent hydrocarbon group having 1 to 20 carbon atoms which may have an ester structure and/or an ether structure, each Y 1  may be the same as or different from one another, and R 1  represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms. 
     
     
       2. The polyisocyanate mixture according to  claim 1 ,
 wherein a content of the triisocyanate compound (A) is in a range of 10% by mass to 90% by mass based on a total amount of the polyisocyanate mixture. 
 
     
     
       3. A coating composition comprising:
 the polyisocyanate mixture according to  claim 1 ; and 
 a compound which has two or more active hydrogens in a molecule. 
 
     
     
       4. A coating film which is obtained by curing the coating composition according to  claim 3 . 
     
     
       5. The polyisocyanate mixture according to  claim 1 ,
 wherein a number average molecular weight of the polyisocyanate (B1) is in a range of 850 to 4000. 
 
     
     
       6. The polyisocyanate mixture according to  claim 1 ,
 wherein an average number of isocyanate groups contained in one molecule of the polyisocyanate in the polyisocyanate mixture is in a range of 3.2 to 8. 
 
     
     
       7. A polyisocyanate mixture comprising:
 a triisocyanate compound (A) represented by Formula (I); and 
 polyisocyanate (B4) which is obtained from aliphatic diisocyanate containing at least 1,6-diisocyanatohexane and in which an expression of (a+b)/(a+b+c+d+e+f) in a case where each mol % of an uretdione structure, an iminooxadiazine dione structure, an isocyanurate structure, an allophanate structure, a urethane structure, and a biuret structure is set as a, b, c, d, e, and f is in a range of 0.02 to 0.50; 
 wherein Formula (I) is 
 
       
         
           
           
               
               
           
         
       
       in which each Y 1  independently represents a single bond or a divalent hydrocarbon group having 1 to 20 carbon atoms which may have an ester structure and/or an ether structure, each Y 1  may be the same as or different from one another, and R 1  represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms. 
     
     
       8. The polyisocyanate mixture according to  claim 7 ,
 wherein the polyisocyanate (B4) contains 1% to 40% by mass of an uretdione dimer derived from aliphatic isocyanate based on a total amount of the polyisocyanate mixture.